Yes, but what is the gain / antenna factor of your Miniwhip? Measuing -115dBm means little in itself, you need to convert this to a calibrated V/m form. IF the miniwhip were exactly 1m long and po
I dunno.... Some 99p headphone 'dongles' from Ebay deserve that sort of treatment. Andy www.g4jnt.com On 25 February 2010 11:16, Chris <[email protected]> wrote: You should NEVER 'stick an
WSPR looks at the energy in 1.5Hz bins, or chunks, and effectively filters the signal to this bandwidth. If the noise impulses ar eof significantly shorter duration, they will be smeared outas well
See if you can decode it - the plot looks as if the signal strong enough. The PSK31 appears every 15 minutes at hh:04:30, hh:19:30 hh:34:30 and hh:49:30 Andy www.g4jnt.com 2010/2/1 Lubos OK2BVG <bv
A follow up to this sage After much puzzling over the design, and comment here about how it must be 3:1 teh only solution was to measure it. So I connected up and measured voltages. Indeed, it d
I remember having several QSOs with myself on 73kHz. Once drove 8km from home to /P sites several times to test the distance before other stations appeared. One time the signal just stopped, so went
...wishing I'd persued the NoV application a few years ago instead of just letting it slide into oblivion... Has anyone yet tried a ground loop at 9kHz? That was going to be my first (and probabl
Jim - How did you manage this? Never seen one like it before. A false WSPR decode, but the identical message appearing twice, 124 Hz apart. Must have been an interesting burst of pulsed WB interfe
I wondered that, but 500pF as measured, if genuine at 10kHz, works out at -j 32000, which is close to the 70k Real term. The series equivalents are therefore 12k - j26.5k - which still doesn't s
I've been doing some tests with the BT Internet ADSL connection and trying to find out if there is any mutual interference. The 500kHz beacon transmission seems to make no difference whatsover
Yahoo handle BT Internet email - that why you see the Y reference. The spam classification is not a Yahoo thing, I get all messages correctly from the LF group so the address is know to the Y provi
Over the next day or two there are likely to be some disruption to my regular beacons transmissions on 503.7kHz and 503.875kHz WSPR. This is due to the installation of a new 'shed' to house loa
If you go the the extent of UT synced FSK, then you'll gain another 3dB by using BPSK. FSK is an orthogonal signalling mode, where you test the power level in one slot (frequency bin) against that
On 73kHz I originally used nylon strimmer cord as the antenna insulator. Worked fine until one day I was testing using PSK (100% duty cycle, long transmission) with G4GVC and it was raining. The a
Hi Alan + All... Actually its a bit more complicated on its own... The physical length of the element is 0.75m, which is appreciably longer than the electrical effective length. And I'm betting
I have a calibrated E Field antenna (Procomm AAC-1) with a quoted antenna-factor of 0.15V into 50 ohms when placed in a field of 1V/m, This is mounted in the centre of a car roof and fed via a bulk
On the basis of two measurements out in the field - the results suggests the voltage being picked up is slightly more than the effective length as stated, but resukts for such a quick first approxiom
Also, although it doesn't appear to be linked to that web page, http://www.g4jnt.com/JT4_Bcn.zip Is a simpler piC code that generates JT4 messages and outputs the data to a pair of l;ogic lines
While we're on natural radio phenonema... These were recorded years ago in 1997, in the early days of amateur radio DSP. They are of a carrier on 3572kHz transmitted, from me to G3PLX in Cumbria,
I've noticed a curious odditity on a Motorola M12 GPS module, when started up completely from cold with no stored almanac data: When the module eventually 'appears' to lock up and show the correct
